After seeing that my wireless speeds were much faster than the speeds I was getting over Ethernet, I decided to invest in some new cables. I didn’t know it before, but I saw while I was changing them out that my current cables were Cat 5e. While putting my network together, I had just been grabbing whatever cables I could find in my scrap drawers. Now I have Cat 8 cables and my speeds jumped from 7MB/s to an average of over 40MB/s. It’s a much bigger improvement than I expected, especially for such a small investment.
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I have stable ~950 MBit/s to the NAS with Cat5e. That’s ~115 MB/s. If that 40 is to a machine on the LAN, either there is some bottle neck at one of the ends, or there’s some problem with the cable to the RJ-45 jacks.